HTTP response headers

Purpose

The following data table describes HTTP response headers.

Header	Description
Content-Encoding	Indicates which encodings were applied to the response body. Value: `gzip`
Content-Type	Indicates the media type of the resource returned. Values: `application/json` (all services except Fetch Glyphs Ranges `application/octet-stream` Fetch Glyph Range `image/png` Fetch Sprite
ETag	Contains an identifier for a specific version of the resource. Value: `string`
Cache-Control	Contains directives (instructions) that control caching in browsers and shared caches. The specific directives vary depending on the resource type and whether the requested asset version contains wildcards. See Assets versioning . Value: `string`
Tracking-ID	An identifier for the request. If the Tracking-ID header was specified in the request, it is replicated in the response. Otherwise, it is generated automatically by the service. For details check RFC 4122 . It is only meant to be used for support and does not involve tracking of you or your users in any form. Value: `string`